Senior Java Backend Developer

Responsibilities

• Design and develop backend services using Java (17+/21 target) and Spring Boot, including authentication flows, session management, token handling, and user/account services;
• Implement and maintain RESTful APIs (OpenAPI), including input validation, structured error handling, logging, and auditing;
• Develop and support data import and reconciliation jobs (ASV/ASD), processing pipelines, and monitoring integrations;
• Build and maintain provisioning connectors (SCIM/API) with a focus on resiliency (retries, idempotency, fault tolerance);
• Write and maintain unit and integration tests; participate in peer code reviews;
• Identify and fix defects, performance issues, and security vulnerabilities;
• Support platform upgrades (Java LTS versions, third-party dependencies) and ensure runtime compatibility;
• Contribute to CI/CD pipelines (Bamboo) and maintain technical documentation (Confluence);
• Typical Deliverables;
• Backend source code and related modules;
• REST API specifications (OpenAPI);
• Automated unit and integration tests;
• CI/CD pipeline configurations and artifacts;
• Updated technical documentation;

Required Skills & Qualifications

• Strong experience with Java (17+; target 21)
• Solid knowledge of Spring Boot and Spring Security
• Experience with Hibernate/JPA and relational databases (SQL)
• Understanding of authentication and authorization concepts (OIDC, JWT)
• Hands-on experience with Git, Maven, and CI/CD tools (preferably Bamboo)
• Strong understanding of secure coding practices and backend security principles
• Experience designing scalable and resilient backend systems

Language Requirements

• German language proficiency – B2 level or higher (mandatory)

Project Description

Our offer

• Possible fully remote, office, or hybrid work.
• Great office space.
• Permanent employment, the possibility of a B2B contract.
• Work tools.
• Good working atmosphere.
• Additional health insurance.
• Sport card.
• Trainings and certifications.
• Corporate and wellbeing events.
• Souvenirs and presents.

We have over 30 years of experience in providing comprehensive solutions in various industries. During this time, we have achieved success in over 2,000 projects and established development centers in several countries in Europe, the United States, Africa, and Asia. IBA Group develops and integrates custom software, implements proprietary and vendor solutions, and offers technical support and consulting. Fundamental areas: mainframe software, corporate and mobile applications, web, SAP and other ERP, BI, and IBM Tivoli systems.